Reactor and the bike



F. H. KIERSTEAD.

REACTOR AND THE LIKE. AHLICATION FILED mm. 21, I920.

1 ,4; 1 2,8 1 7, Patented Apr. 11, 1922.

2 SHEETSSHEET l- (Gmpere) l/o/f's Char-acfePis-Hc Curve For Carborundum.

Inventor: Friend |-l. Kiers-tea l-lis Attovn F. H. KIEHSTEAD.

REACTOR AND THE LIKE.

. APPLICATION FILED MAR. 27, I920.

1,412,817. Patented P 11, 1922.

2 SHEETS-SHEET 2.

Inventor: -f-rie'nci l-l. Kierstea b His Attorney- UNITED STA TESHPATENT ()FFICE.

MASSACHUSETTS, ASSIGNOR T GENERAL ELECTRIC CVOMPANYJA' CORPORATION OF NEW YORK.

, .imao'roztann THE LIKE.

relates to reactors. and the rotectivei. de-

sorbing the energy of transients. The general objjactof to..provide an i n'lprovedarrapgement of .partshaving high electrical em tenc and e. t fil h- 5 924 y e ay. ha cheaply n1aJiu-factured. 7 L

It known, as pointed ontjn the pat ent.

to CamposNo.

. stallations having resistance and i nductaaice in series, inorder quieklyto damp out high frequenc v v i transients, sho uld have resistors of highconducivity in shunt vith the protectedportionof the line in order "that the damping coeflicient rnay be large. .Shnht resistprs tofiznctionin thisfmanner, in con-' should junction. with protective. r actors.

have high resistance at normal voltages. so as toabsorb littleenergy dur ing. normal opera i utlew ssis e e ns h 9 currence ,of transients-,which .induceghigh voltages order quickly .to absorb the euergy of the transients. Carbornndumand certain other mixtures of known propon tions. as pointed out in Creighton. Patent No. 1,317,002, have this so-called negative ampere-volt characteristic. .A-n arrangement for utilizing a. material having this characteristic in reactors is shown in this Creighton patent where the plastic supporting the reactor coils is made of such material.

By my invention. however. I am enabled to utilize such material without making the supporting substance or plastic body of the reactor out of such material, since I construct a resistor of material, imparting the desired oharasteristic, as a separate entity and adapt the reactor proper to embody such resistor when connected in shunt relalion therewith Specification-oi Letters Yatent.

sistanee in shunt with thei windings for ab ennon is.

19 83 15: that pm t e Patented Apr.-11, 1922.

a lication filed flare h 2'7, 1920. serial No. 369.329.

7 For a more complete understanding of the nature and objects of my invention reference should be had to the following detailed description when taken in connection with the accompanying drawing which: Fig. 1 is perspective View of a reactor constrn'ct'ed in accordance with my' invention. Fig. 2 is a similar view of the resistoreonstructdas a separate entity'to beeinb odiel in the ractor'shovrn in Fig. 1. Fig. 3 is an explanatory diagra'rm Figs. 4 and 5 are respectii e'ly vertical and horizontal sections of the i'iictor shown in Fig. 1. And Fig. G. is a p'erspectii-e ixiiew of the rsis'tancelelemerits; embodied in the resist'mif shown in .FiQ-IQL M "Referring now-'to the drawings. and particuliirly tdfFigs. 1 and 4. lOqrepres'erits a base formedpreferably of aplasticsueh as mold d2 "ncrete after the maniiers'et forth in CreightonjPatent No. 1317.003.

The base 10 is shown as supported on insulating members 11; the base itself in turn supporting the vertical segmental coil supporting members 12, which-are also preferably made of a' molded plastic. The inem hers 12 are generally wedge shaped and preferably iequidistantly spaced about the periphery of thebase 10. These members,

when molded or cast as the case may be, are

formed to have embedded therein the convolutions 13 of the coiled electrical coiiductor 14 which is provided with taps 15 for connection to the electric line to be proteeted.

In na i-n t ilating "s ace '20.; canmiiy or,

the segmental members 12,1 insert the resister 21 which is separate unit. or entity apart: "from the reactor propenabove described. The resistor may have any suitable form but ishere shown as a plastic block in which are embedded resistance elements 22 which have the desired electrical characteristics and are provided with taps 23 in order to be connected at suitable points, as indicated in Fig. .4. with the coils of the reactor proper. The uppermost and lowermost taps 24 are shown as connected directlv to the line taps 15 of the reactor.

Resistance elements, such as shown at 22, preferably comprise carborundnm rods 3H The rods composing a in clips,

connected in series group are conveniently mounted as shown at 31. conductirely related as shown at 32 preparatory to being arranged for being cast in the plastic block 'COlllPOSlIlg the resistor.

The resistor unit 21 whose elements are connected in shunt with the turns of the re actor is designed to be a complement of the insulating structure supporting the turns. To this end I have shown its as conveniently supported on the base 10 in'nested relation with the reactor proper, but any suitable supportin arrangement may be employed When composed of carborundum resistance elements the protective reactor operates with a negative ampere-volt characteristic substantially as follows:

During normal operation the value of the shunt resistance is so chosen that it is rela tively great, i. c., the normal voltage is on the left hand side of the curve show in Fig. 3, where the value of the resistance isrelatively great, consequently very little energy is consumed in the shunt resistance during normaloperation. Should a transient occur giving rise to an eiscessiveor resonant voltage in the reactor, the increased voltage attending the phenomenon is accompanied by a decrease in the value of the shunt resistance, as indicated in Fig. 3. Theconducti'v ity'of the'paths in Shunt'to the line is consequently materiallydncreased and the ener y of the transient'quiekly absorbed.

ile I'have here shown an embbdiment of my invention which is, at present the best means known to me for carrying the same into effect, I would have it understood that this is merely illustrative and that I do not mean to be limitedthereby to the precise details herddisclos'edsine obvious alterations thereofwillappearto those'skilled in this art, nor restricted in the'choice of recognized equivalentsexcept as defined in my claims hereunto annexe v What Iclaim as new and desire to secure by Letters Patent of the United States, is

1. The combination with a reactor, of a resistor. comprising a separate unit/composed of resistance elements having a negative ampere-volt characteristic and; arranged to be connected in shunt with t-hefturns of said reactor, and a connection between thejunction of two of said'resistanceelements and an interniediate portion of said reactor.

2. The combination with a reactor, of a resistor comprising a plastic block embedding resistance elements' having a desired electrical characteristic, said elements being provided with taps connecting one of said elements in shunt with one portion of said reactor and another of said elements in shunt with another portion of said reactor.

3. The combination with a reactor having a central ventilating passage, of a resistor comprisin a block of plastic material having suitab e resistance elements embedded therein, said resistor being located in said central passage and being connected in shunt to the turns of said reactor.

4. The combination with a reactor comprising plastic supporting elements disposed i-ircumfercntially of a coiled conductor having its turns-embedded in said supporting elements, of a resistor unit comprising a plastic block containin carborundum resistance elements provided with taps on the exterior of the block, said block being arranged to be supported centrally of said supporting elements and having thetaps connected to said turns at predetermined points.

5. The combination with a conductor coiled about a hollow space, of an insulating means supporting said conductor, and a'resistorunit having one portion of its'resis'tance connected in shunt with one said conductor and another portion'of its portion of 5. resistance connected in, shunt with another portion of said conductor,said resistor bing located in said space surrounded by the conductor to form. therewith a unitary pro-' tective device.

6. The combination with a'coiled conductor, of circumferentially s aced insulating supporting members embed ing said conductor a re'si stor unit comprising resistance elements connected in shunt with the convolu-' ing said members and said unit in nested'relation.

i tions of said conductor,- and a base support} l 7. The combination with a coiled 'conduc- 

